I will never understand the complaint of Bruce getting back to Gotham...ISN'T he somewhat of a ninja since having been trained by the League of Shadows? I would think it's quite possible for someone like Bruce Wayne to sneak into Gotham while others can't.

It's an excuse to nitpick. He's a ninja, and he's the goddamn batman..that should be enough. He even tells Selina that he has a way in and out. He hints that there's some way to do it but only he knows. Put two and two together. It's because he's a goddamn ninja. Don't forget he's been a billionaire for a long time and Wayne Manor is on the outskirts. Surely there's a special way around that area.